jirakrit leelarungrayub department of physical therapy, faculty of associated medical sciences, chiang mai university, chiang mai 50200, thailand; department of physical therapy, faculty of associated medical sciences, chiang mai university, chiang mai 50200, thailand. tel: +66-53936072, fax: +66-53936042 decha pinkaew department of physical therapy, faculty of associated medical sciences, chiang mai university, chiang mai 50200, thailand jakkrit klaphajone department of rehabilitation medicine, faculty of medicine, chiang mai university, chiang mai 50200, thailand wichai eungpinichpong research center in back, neck, other joint pain and human performance, khon kaen university, khon kaen 40002, thailand richard j. bloomer cardiorespiratory/metabolic laboratory, school of health studies, university of memphis, memphis tn 38152, usa

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